The Twister, Part I
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The stock valvesprings (left) will handle the additional lift of the 1.6 roller rockers, but the best move is to install a set of GM Performance Parts LT4 valvesprings (right). These stiffer springs will bolt in place of the stockers with no machining required and can handle the lift of the GM Performance Parts Hot hydraulic roller cam that we’ll install next month. View Related Article
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